[PATCH V5 08/10] aacraid: Fix AIF triggered IOP_RESET

Raghava Aditya Renukunta
2016-02-03T00:48:06Z

while driver removal is in progress or PCI shutdown is invoked, driver
kills AIF aacraid thread, but IOCTL requests from the management tools
re-start AIF thread leading to IOP_RESET.

Fixed by setting adapter_shutdown flag when PCI shutdown is invoked.

Changes in V2:
Set adapter_shutdown flag before shutdown command is sent to \
controller

Changes in V3:
Call aac_send_shut_shutdown first thing in __aac_shutdown
Convert adapter_shutdown to atomic_t variable to prevent \
SMP coherency issues(race conditions)

Changes in V4:
Used mutex to protect ioctl path and adapter_shutdown to prevent \
race conditions.

Changes in V5:
Moved replacement of aac_mutex with ioctl_mutex to previous patch

Signed-off-by: Raghava Aditya Renukunta <raghavaaditya.renukunta@pmcs.com>
Reviewed-by: Shane Seymour <shane.seymour@hpe.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
---
drivers/scsi/aacraid/commctrl.c | 3 +++
drivers/scsi/aacraid/comminit.c | 6 ++++--
drivers/scsi/aacraid/linit.c | 5 +++--
3 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/aacraid/commctrl.c b/drivers/scsi/aacraid/commctrl.c
index 4d5f4e7..f6692d1 100644
--- a/drivers/scsi/aacraid/commctrl.c
+++ b/drivers/scsi/aacraid/commctrl.c
@@ -857,6 +857,9 @@ int aac_do_ioctl(struct aac_dev * dev, int cmd, void __user *arg)

mutex_lock(&dev->ioctl_mutex);

+ if (dev->adapter_shutdown)
+ return -EACCES;
+
/*
* HBA gets first crack
*/
diff --git a/drivers/scsi/aacraid/comminit.c b/drivers/scsi/aacraid/comminit.c
index 0e954e3..2b4e753 100644
--- a/drivers/scsi/aacraid/comminit.c
+++ b/drivers/scsi/aacraid/comminit.c
@@ -212,8 +212,11 @@ int aac_send_shutdown(struct aac_dev * dev)
return -ENOMEM;
aac_fib_init(fibctx);

- cmd = (struct aac_close *) fib_data(fibctx);
+ mutex_lock(&dev->ioctl_mutex);
+ dev->adapter_shutdown = 1;
+ mutex_unlock(&dev->ioctl_mutex);

+ cmd = (struct aac_close *) fib_data(fibctx);
cmd->command = cpu_to_le32(VM_CloseAll);
cmd->cid = cpu_to_le32(0xfffffffe);

@@ -229,7 +232,6 @@ int aac_send_shutdown(struct aac_dev * dev)
/* FIB should be freed only after getting the response from the F/W */
if (status != -ERESTARTSYS)
aac_fib_free(fibctx);
- dev->adapter_shutdown = 1;
if ((dev->pdev->device == PMC_DEVICE_S7 ||
dev->pdev->device == PMC_DEVICE_S8 ||
dev->pdev->device == PMC_DEVICE_S9) &&
diff --git a/drivers/scsi/aacraid/linit.c b/drivers/scsi/aacraid/linit.c
index 5f08bcf..2c7405a 100644
--- a/drivers/scsi/aacraid/linit.c
+++ b/drivers/scsi/aacraid/linit.c
@@ -703,7 +703,7 @@ static int aac_cfg_open(struct inode *inode, struct file *file)
static long aac_cfg_ioctl(struct file *file,
unsigned int cmd, unsigned long arg)
{
- if (!capable(CAP_SYS_RAWIO) || aac->adapter_shutdown)
+ if (!capable(CAP_SYS_RAWIO))
return -EPERM;
return aac_do_ioctl(file->private_data, cmd, (void __user *)arg);
}
@@ -1069,6 +1069,8 @@ static void __aac_shutdown(struct aac_dev * aac)
int i;
int cpu;

+ aac_send_shutdown(aac);
+
if (aac->aif_thread) {
int i;
/* Clear out events first */
@@ -1080,7 +1082,6 @@ static void __aac_shutdown(struct aac_dev * aac)
}
kthread_stop(aac->thread);
}
- aac_send_shutdown(aac);
aac_adapter_disable_int(aac);
cpu = cpumask_first(cpu_online_mask);
if (aac->pdev->device == PMC_DEVICE_S6 ||
--
1.9.1