tpm_tis: Tighten IRQ auto-probing

auto-probing doesn't work with shared interrupts, and the auto detection
interrupt range is for x86 only.

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Martin Wilck <Martin.Wilck@ts.fujitsu.com>
Tested-by: Scot Doyle <lkml14@scotdoyle.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Acked-by: Peter Huewe <peterhuewe@gmx.de>

1 files changed, 12 insertions, 7 deletions

diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index c29ae69f1df6..8a3509cb10da 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -603,12 +603,13 @@ static irqreturn_t tis_int_handler(int dummy, void *dev_id)
  * irq is seen then leave the chip setup for IRQ operation, otherwise reverse
  * everything and leave in polling mode. Returns 0 on success.
  */
-static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask, int irq)
+static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask,
+                                    int flags, int irq)
 {
         struct priv_data *priv = chip->vendor.priv;
         u8 original_int_vec;
 
-        if (devm_request_irq(chip->pdev, irq, tis_int_handler, IRQF_SHARED,
+        if (devm_request_irq(chip->pdev, irq, tis_int_handler, flags,
                              chip->devname, chip) != 0) {
                 dev_info(chip->pdev, "Unable to request irq: %d for probe\n",
                          irq);
@@ -666,10 +667,13 @@ static void tpm_tis_probe_irq(struct tpm_chip *chip, u32 intmask)
                                    TPM_INT_VECTOR(chip->vendor.locality));
 
         if (!original_int_vec) {
-                for (i = 3; i <= 15; i++)
-                        if (!tpm_tis_probe_irq_single(chip, intmask, i))
-                                return;
-        } else if (!tpm_tis_probe_irq_single(chip, intmask, original_int_vec))
+                if (IS_ENABLED(CONFIG_X86))
+                        for (i = 3; i <= 15; i++)
+                                if (!tpm_tis_probe_irq_single(chip, intmask, 0,
+                                                              i))
+                                        return;
+        } else if (!tpm_tis_probe_irq_single(chip, intmask, 0,
+                                             original_int_vec))
                 return;
 }
 
@@ -805,7 +809,8 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info,
         init_waitqueue_head(&chip->vendor.int_queue);
         if (interrupts) {
                 if (tpm_info->irq) {
-                        tpm_tis_probe_irq_single(chip, intmask, tpm_info->irq);
+                        tpm_tis_probe_irq_single(chip, intmask, IRQF_SHARED,
+                                                 tpm_info->irq);
                         if (!chip->vendor.irq)
                                 dev_err(chip->pdev, FW_BUG
                                         "TPM interrupt not working, polling instead\n");