[ALSA] Fix possible races at free_irq in PCI drivers

The irq handler of PCI drivers must be released before releasing other
resources since the handler for a shared irq can be still called and
may access the freed resource again.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

9 files changed, 26 insertions, 32 deletions

diff --git a/sound/pci/ca0106/ca0106_main.c b/sound/pci/ca0106/ca0106_main.c
index 3818249fcc81..ecbe79b67e43 100644
--- a/sound/pci/ca0106/ca0106_main.c
+++ b/sound/pci/ca0106/ca0106_main.c
@@ -1114,6 +1114,8 @@ static int snd_ca0106_free(struct snd_ca0106 *chip)
                  * So we can fix: snd-malloc: Memory leak?  pages not freed = 8
                  */
         }
+        if (chip->irq >= 0)
+                free_irq(chip->irq, chip);
         // release the data
 #if 1
         if (chip->buffer.area)
@@ -1123,9 +1125,6 @@ static int snd_ca0106_free(struct snd_ca0106 *chip)
         // release the i/o port
         release_and_free_resource(chip->res_port);
 
-        // release the irq
-        if (chip->irq >= 0)
-                free_irq(chip->irq, chip);
         pci_disable_device(chip->pci);
         kfree(chip);
         return 0;
diff --git a/sound/pci/cs46xx/cs46xx_lib.c b/sound/pci/cs46xx/cs46xx_lib.c
index 87ddffcd9d89..e214e567dec8 100644
--- a/sound/pci/cs46xx/cs46xx_lib.c
+++ b/sound/pci/cs46xx/cs46xx_lib.c
@@ -2772,6 +2772,9 @@ static int snd_cs46xx_free(struct snd_cs46xx *chip)
         if (chip->irq >= 0)
                 free_irq(chip->irq, chip);
 
+        if (chip->active_ctrl)
+                chip->active_ctrl(chip, -chip->amplifier);
+
         for (idx = 0; idx < 5; idx++) {
                 struct snd_cs46xx_region *region = &chip->region.idx[idx];
                 if (region->remap_addr)
@@ -2779,9 +2782,6 @@ static int snd_cs46xx_free(struct snd_cs46xx *chip)
                 release_and_free_resource(region->resource);
         }
 
-        if (chip->active_ctrl)
-                chip->active_ctrl(chip, -chip->amplifier);
-        
 #ifdef CONFIG_SND_CS46XX_NEW_DSP
         if (chip->dsp_spos_instance) {
                 cs46xx_dsp_spos_destroy(chip);
diff --git a/sound/pci/echoaudio/echoaudio.c b/sound/pci/echoaudio/echoaudio.c
index 90ec090792ba..e16dc92e82fb 100644
--- a/sound/pci/echoaudio/echoaudio.c
+++ b/sound/pci/echoaudio/echoaudio.c
@@ -1852,15 +1852,16 @@ static irqreturn_t snd_echo_interrupt(int irq, void *dev_id)
 static int snd_echo_free(struct echoaudio *chip)
 {
         DE_INIT(("Stop DSP...\n"));
-        if (chip->comm_page) {
+        if (chip->comm_page)
                 rest_in_peace(chip);
-                snd_dma_free_pages(&chip->commpage_dma_buf);
-        }
         DE_INIT(("Stopped.\n"));
 
         if (chip->irq >= 0)
                 free_irq(chip->irq, chip);
 
+        if (chip->comm_page)
+                snd_dma_free_pages(&chip->commpage_dma_buf);
+
         if (chip->dsp_registers)
                 iounmap(chip->dsp_registers);
 
diff --git a/sound/pci/emu10k1/emu10k1_main.c b/sound/pci/emu10k1/emu10k1_main.c
index 9a9b977d3cf1..abde5b901884 100644
--- a/sound/pci/emu10k1/emu10k1_main.c
+++ b/sound/pci/emu10k1/emu10k1_main.c
@@ -1249,11 +1249,6 @@ static int snd_emu10k1_free(struct snd_emu10k1 *emu)
         if (emu->port) {        /* avoid access to already used hardware */
                 snd_emu10k1_fx8010_tram_setup(emu, 0);
                 snd_emu10k1_done(emu);
-                /* remove reserved page */
-                if (emu->reserved_page) {
-                        snd_emu10k1_synth_free(emu, (struct snd_util_memblk *)emu->reserved_page);
-                        emu->reserved_page = NULL;
-                }
                 snd_emu10k1_free_efx(emu);
         }
         if (emu->card_capabilities->emu_model == EMU_MODEL_EMU1010) {
@@ -1262,6 +1257,14 @@ static int snd_emu10k1_free(struct snd_emu10k1 *emu)
         }
         if (emu->emu1010.firmware_thread)
                 kthread_stop(emu->emu1010.firmware_thread);
+        if (emu->irq >= 0)
+                free_irq(emu->irq, emu);
+        /* remove reserved page */
+        if (emu->reserved_page) {
+                snd_emu10k1_synth_free(emu,
+                        (struct snd_util_memblk *)emu->reserved_page);
+                emu->reserved_page = NULL;
+        }
         if (emu->memhdr)
                 snd_util_memhdr_free(emu->memhdr);
         if (emu->silent_page.area)
@@ -1273,8 +1276,6 @@ static int snd_emu10k1_free(struct snd_emu10k1 *emu)
 #ifdef CONFIG_PM
         free_pm_buffer(emu);
 #endif
-        if (emu->irq >= 0)
-                free_irq(emu->irq, emu);
         if (emu->port)
                 pci_release_regions(emu->pci);
         if (emu->card_capabilities->ca0151_chip) /* P16V */     
diff --git a/sound/pci/emu10k1/emu10k1x.c b/sound/pci/emu10k1/emu10k1x.c
index 341f34e19f3c..491a4a50f869 100644
--- a/sound/pci/emu10k1/emu10k1x.c
+++ b/sound/pci/emu10k1/emu10k1x.c
@@ -754,13 +754,13 @@ static int snd_emu10k1x_free(struct emu10k1x *chip)
         // disable audio
         outl(HCFG_LOCKSOUNDCACHE, chip->port + HCFG);
 
-        // release the i/o port
-        release_and_free_resource(chip->res_port);
-
-        // release the irq
+        /* release the irq */
         if (chip->irq >= 0)
                 free_irq(chip->irq, chip);
 
+        // release the i/o port
+        release_and_free_resource(chip->res_port);
+
         // release the DMA
         if (chip->dma_buffer.area) {
                 snd_dma_free_pages(&chip->dma_buffer);
diff --git a/sound/pci/intel8x0m.c b/sound/pci/intel8x0m.c
index 15db810d5893..faf674e671ac 100644
--- a/sound/pci/intel8x0m.c
+++ b/sound/pci/intel8x0m.c
@@ -985,18 +985,15 @@ static int snd_intel8x0_free(struct intel8x0m *chip)
         /* reset channels */
         for (i = 0; i < chip->bdbars_count; i++)
                 iputbyte(chip, ICH_REG_OFF_CR + chip->ichd[i].reg_offset, ICH_RESETREGS);
-        /* --- */
+ __hw_end:
         if (chip->irq >= 0)
-                synchronize_irq(chip->irq);
-      __hw_end:
+                free_irq(chip->irq, chip);
         if (chip->bdbars.area)
                 snd_dma_free_pages(&chip->bdbars);
         if (chip->addr)
                 pci_iounmap(chip->pci, chip->addr);
         if (chip->bmaddr)
                 pci_iounmap(chip->pci, chip->bmaddr);
-        if (chip->irq >= 0)
-                free_irq(chip->irq, chip);
         pci_release_regions(chip->pci);
         pci_disable_device(chip->pci);
         kfree(chip);
@@ -1018,7 +1015,6 @@ static int intel8x0m_suspend(struct pci_dev *pci, pm_message_t state)
                 snd_pcm_suspend_all(chip->pcm[i]);
         snd_ac97_suspend(chip->ac97);
         if (chip->irq >= 0) {
-                synchronize_irq(chip->irq);
                 free_irq(chip->irq, chip);
                 chip->irq = -1;
         }
diff --git a/sound/pci/korg1212/korg1212.c b/sound/pci/korg1212/korg1212.c
index 10c713d9ac49..f4c85b52bde3 100644
--- a/sound/pci/korg1212/korg1212.c
+++ b/sound/pci/korg1212/korg1212.c
@@ -2102,7 +2102,6 @@ snd_korg1212_free(struct snd_korg1212 *korg1212)
         snd_korg1212_TurnOffIdleMonitor(korg1212);
 
         if (korg1212->irq >= 0) {
-                synchronize_irq(korg1212->irq);                
                 snd_korg1212_DisableCardInterrupts(korg1212);
                 free_irq(korg1212->irq, korg1212);
                 korg1212->irq = -1;
diff --git a/sound/pci/nm256/nm256.c b/sound/pci/nm256/nm256.c
index 7ac654e381da..7efb838d18a6 100644
--- a/sound/pci/nm256/nm256.c
+++ b/sound/pci/nm256/nm256.c
@@ -1439,7 +1439,7 @@ static int snd_nm256_free(struct nm256 *chip)
                 snd_nm256_capture_stop(chip);
 
         if (chip->irq >= 0)
-                synchronize_irq(chip->irq);
+                free_irq(chip->irq, chip);
 
         if (chip->cport)
                 iounmap(chip->cport);
@@ -1447,8 +1447,6 @@ static int snd_nm256_free(struct nm256 *chip)
                 iounmap(chip->buffer);
         release_and_free_resource(chip->res_cport);
         release_and_free_resource(chip->res_buffer);
-        if (chip->irq >= 0)
-                free_irq(chip->irq, chip);
 
         pci_disable_device(chip->pci);
         kfree(chip->ac97_regs);
diff --git a/sound/pci/trident/trident_main.c b/sound/pci/trident/trident_main.c
index 71138ff9b310..bbcee2c09ae4 100644
--- a/sound/pci/trident/trident_main.c
+++ b/sound/pci/trident/trident_main.c
@@ -3676,6 +3676,8 @@ static int snd_trident_free(struct snd_trident *trident)
         else if (trident->device == TRIDENT_DEVICE_ID_SI7018) {
                 outl(0, TRID_REG(trident, SI_SERIAL_INTF_CTRL));
         }
+        if (trident->irq >= 0)
+                free_irq(trident->irq, trident);
         if (trident->tlb.buffer.area) {
                 outl(0, TRID_REG(trident, NX_TLBC));
                 if (trident->tlb.memhdr)
@@ -3685,8 +3687,6 @@ static int snd_trident_free(struct snd_trident *trident)
                 vfree(trident->tlb.shadow_entries);
                 snd_dma_free_pages(&trident->tlb.buffer);
         }
-        if (trident->irq >= 0)
-                free_irq(trident->irq, trident);
         pci_release_regions(trident->pci);
         pci_disable_device(trident->pci);
         kfree(trident);