1 files changed, 37 insertions, 15 deletions

diff --git a/sound/pci/emu10k1/io.c b/sound/pci/emu10k1/io.c
index a02638350a0a..b5a802bdeb7c 100644
--- a/sound/pci/emu10k1/io.c
+++ b/sound/pci/emu10k1/io.c
@@ -70,6 +70,11 @@ void snd_emu10k1_ptr_write(struct snd_emu10k1 *emu, unsigned int reg, unsigned i
         unsigned long flags;
         unsigned int mask;
 
+        if (!emu) {
+                snd_printk(KERN_ERR "ptr_write: emu is null!\n");
+                dump_stack();
+                return;
+        }
         mask = emu->audigy ? A_PTR_ADDRESS_MASK : PTR_ADDRESS_MASK;
         regptr = ((reg << 16) & mask) | (chn & PTR_CHANNELNUM_MASK);
 
@@ -134,15 +139,23 @@ int snd_emu10k1_spi_write(struct snd_emu10k1 * emu,
         unsigned int reset, set;
         unsigned int reg, tmp;
         int n, result;
+        int err = 0;
+
+        /* This function is not re-entrant, so protect against it. */
+        spin_lock(&emu->spi_lock);
         if (emu->card_capabilities->ca0108_chip)
                 reg = 0x3c; /* PTR20, reg 0x3c */
         else {
                 /* For other chip types the SPI register
                  * is currently unknown. */
-                return 1;
+                err = 1;
+                goto spi_write_exit;
+        }
+        if (data > 0xffff) {
+                /* Only 16bit values allowed */
+                err = 1;
+                goto spi_write_exit;
         }
-        if (data > 0xffff) /* Only 16bit values allowed */
-                return 1;
 
         tmp = snd_emu10k1_ptr20_read(emu, reg, 0);
         reset = (tmp & ~0x3ffff) | 0x20000; /* Set xxx20000 */
@@ -160,11 +173,17 @@ int snd_emu10k1_spi_write(struct snd_emu10k1 * emu,
                         break;
                 }
         }
-        if (result) /* Timed out */
-                return 1;
+        if (result) {
+                /* Timed out */
+                err = 1;
+                goto spi_write_exit;
+        }
         snd_emu10k1_ptr20_write(emu, reg, 0, reset | data);
         tmp = snd_emu10k1_ptr20_read(emu, reg, 0); /* Write post */
-        return 0;
+        err = 0;
+spi_write_exit:
+        spin_unlock(&emu->spi_lock);
+        return err;
 }
 
 /* The ADC does not support i2c read, so only write is implemented */
@@ -176,15 +195,17 @@ int snd_emu10k1_i2c_write(struct snd_emu10k1 *emu,
         int timeout = 0;
         int status;
         int retry;
+        int err = 0;
+
         if ((reg > 0x7f) || (value > 0x1ff)) {
                 snd_printk(KERN_ERR "i2c_write: invalid values.\n");
                 return -EINVAL;
         }
 
+        /* This function is not re-entrant, so protect against it. */
+        spin_lock(&emu->i2c_lock);
+
         tmp = reg << 25 | value << 16;
-        // snd_printk("I2C-write:reg=0x%x, value=0x%x\n", reg, value);
-        /* Not sure what this I2C channel controls. */
-        /* snd_emu10k1_ptr_write(emu, P17V_I2C_0, 0, tmp); */
 
         /* This controls the I2C connected to the WM8775 ADC Codec */
         snd_emu10k1_ptr20_write(emu, P17V_I2C_1, 0, tmp);
@@ -192,17 +213,14 @@ int snd_emu10k1_i2c_write(struct snd_emu10k1 *emu,
 
         for (retry = 0; retry < 10; retry++) {
                 /* Send the data to i2c */
-                //tmp = snd_emu10k1_ptr_read(emu, P17V_I2C_ADDR, 0);
-                //tmp = tmp & ~(I2C_A_ADC_READ|I2C_A_ADC_LAST|I2C_A_ADC_START|I2C_A_ADC_ADD_MASK);
                 tmp = 0;
                 tmp = tmp | (I2C_A_ADC_LAST|I2C_A_ADC_START|I2C_A_ADC_ADD);
                 snd_emu10k1_ptr20_write(emu, P17V_I2C_ADDR, 0, tmp);
 
                 /* Wait till the transaction ends */
                 while (1) {
-                        udelay(10);
+                        mdelay(1);
                         status = snd_emu10k1_ptr20_read(emu, P17V_I2C_ADDR, 0);
-                        // snd_printk("I2C:status=0x%x\n", status);
                         timeout++;
                         if ((status & I2C_A_ADC_START) == 0)
                                 break;
@@ -219,10 +237,14 @@ int snd_emu10k1_i2c_write(struct snd_emu10k1 *emu,
 
         if (retry == 10) {
                 snd_printk(KERN_ERR "Writing to ADC failed!\n");
-                return -EINVAL;
+                snd_printk(KERN_ERR "status=0x%x, reg=%d, value=%d\n",
+                        status, reg, value);
+                /* dump_stack(); */
+                err = -EINVAL;
         }
     
-        return 0;
+        spin_unlock(&emu->i2c_lock);
+        return err;
 }
 
 int snd_emu1010_fpga_write(struct snd_emu10k1 * emu, u32 reg, u32 value)