From: James Bottomley  <James.Bottomley@steeleye.com>
Date: Wed, 18 May 2005 02:09:52 +0000 (-0500)
Subject: [SCSI] aic7xxx: add back locking
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=fb3089dfb58bf07992252b42e77c6f35d45dff5e;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

[SCSI] aic7xxx: add back locking

Tampering with the settings has to be done under the host lock ...
slave_alloc isn't called under any lock, so this has to be done
explicitly.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
---

diff --git a/drivers/scsi/aic7xxx/aic7xxx_osm.c b/drivers/scsi/aic7xxx/aic7xxx_osm.c
index c03f29486071..b216de41bff4 100644
--- a/drivers/scsi/aic7xxx/aic7xxx_osm.c
+++ b/drivers/scsi/aic7xxx/aic7xxx_osm.c
@@ -645,7 +645,9 @@ ahc_linux_slave_alloc(struct scsi_device *device)
 	struct ahc_linux_target *targ;
 	struct scsi_target *starget = device->sdev_target;
 	struct ahc_linux_device *dev;
-	u_int target_offset;
+	unsigned int target_offset;
+	unsigned long flags;
+	int retval = -ENOMEM;
 
 	target_offset = starget->id;
 	if (starget->channel != 0)
@@ -654,12 +656,14 @@ ahc_linux_slave_alloc(struct scsi_device *device)
 	ahc = *((struct ahc_softc **)device->host->hostdata);
 	if (bootverbose)
 		printf("%s: Slave Alloc %d\n", ahc_name(ahc), device->id);
+	ahc_lock(ahc, &flags);
 	targ = ahc->platform_data->targets[target_offset];
 	if (targ == NULL) {
 		targ = ahc_linux_alloc_target(ahc, starget->channel, starget->id);
 		struct seeprom_config *sc = ahc->seep_config;
 		if (targ == NULL)
-			return -ENOMEM;
+			goto out;
+
 		if (sc) {
 			unsigned short scsirate;
 			struct ahc_devinfo devinfo;
@@ -701,10 +705,13 @@ ahc_linux_slave_alloc(struct scsi_device *device)
 	if (dev == NULL) {
 		dev = ahc_linux_alloc_device(ahc, targ, device->lun);
 		if (dev == NULL)
-			return -ENOMEM;
+			goto out;
 	}
+	retval = 0;
 
-	return 0;
+ out:
+	ahc_unlock(ahc, &flags);
+	return retval;
 }
 
 static int