[PATCH 13/14] scsi: message: fusion: Remove in_interrupt() usage in mpt_config().

Sebastian Andrzej Siewior
2020-11-26T13:30:40Z

From: Thomas Gleixner <tglx@linutronix.de>

in_interrupt() is referenced all over the place in these drivers. Most of
these references are comments which are outdated and wrong.

Aside of that in_interrupt() is deprecated as it does not provide what the
name suggests. It covers more than hard/soft interrupt servicing context
and is semantically ill defined.

From reading the mpt_config() code and the history this is clearly a
debug mechanism and should probably be replaced by might_sleep() or
completely removed because such checks are already in the subsequent
functions.

Remove the in_interrupt() references and replace the usage in
mpt_config() with might_sleep().

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Sathya Prakash <sathya.prakash@broadcom.com>
Cc: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Cc: Suganath Prabu Subramani <suganath-prabu.subramani@broadcom.com>
Cc: MPT-FusionLinux.pdl@broadcom.com
---
drivers/message/fusion/mptbase.c | 14 ++------------
drivers/message/fusion/mptfc.c | 2 +-
drivers/message/fusion/mptscsih.c | 2 +-
drivers/message/fusion/mptspi.c | 2 +-
4 files changed, 5 insertions(+), 15 deletions(-)

diff --git a/drivers/message/fusion/mptbase.c b/drivers/message/fusion/mptbase.c
index 3078fac34e51f..549797d0301d8 100644
--- a/drivers/message/fusion/mptbase.c
+++ b/drivers/message/fusion/mptbase.c
@@ -57,7 +57,7 @@
#include <linux/kdev_t.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
-#include <linux/interrupt.h> /* needed for in_interrupt() proto */
+#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/kthread.h>
#include <scsi/scsi_host.h>
@@ -6335,7 +6335,6 @@ SendEventAck(MPT_ADAPTER *ioc, EventNotificationReply_t *evnp)
* Page header is updated.
*
* Returns 0 for success
- * -EPERM if not allowed due to ISR context
* -EAGAIN if no msg frames currently available
* -EFAULT for non-successful reply or no reply (timeout)
*/
@@ -6353,19 +6352,10 @@ mpt_config(MPT_ADAPTER *ioc, CONFIGPARMS *pCfg)
u8 page_type = 0, extend_page;
unsigned long timeleft;
unsigned long flags;
- int in_isr;
u8 issue_hard_reset = 0;
u8 retry_count = 0;

- /* Prevent calling wait_event() (below), if caller happens
- * to be in ISR context, because that is fatal!
- */
- in_isr = in_interrupt();
- if (in_isr) {
- dcprintk(ioc, printk(MYIOC_s_WARN_FMT "Config request not allowed in ISR context!\n",
- ioc->name));
- return -EPERM;
- }
+ might_sleep();

/* don't send a config page during diag reset */
spin_lock_irqsave(&ioc->taskmgmt_lock, flags);
diff --git a/drivers/message/fusion/mptfc.c b/drivers/message/fusion/mptfc.c
index f92b0433f599f..0484e9c15c097 100644
--- a/drivers/message/fusion/mptfc.c
+++ b/drivers/message/fusion/mptfc.c
@@ -50,7 +50,7 @@
#include <linux/kdev_t.h>
#include <linux/blkdev.h>
#include <linux/delay.h> /* for mdelay */
-#include <linux/interrupt.h> /* needed for in_interrupt() proto */
+#include <linux/interrupt.h>
#include <linux/reboot.h> /* notifier code */
#include <linux/workqueue.h>
#include <linux/sort.h>
diff --git a/drivers/message/fusion/mptscsih.c b/drivers/message/fusion/mptscsih.c
index e7f0d4ae0f960..ce2e5b21978e2 100644
--- a/drivers/message/fusion/mptscsih.c
+++ b/drivers/message/fusion/mptscsih.c
@@ -52,7 +52,7 @@
#include <linux/kdev_t.h>
#include <linux/blkdev.h>
#include <linux/delay.h> /* for mdelay */
-#include <linux/interrupt.h> /* needed for in_interrupt() proto */
+#include <linux/interrupt.h>
#include <linux/reboot.h> /* notifier code */
#include <linux/workqueue.h>

diff --git a/drivers/message/fusion/mptspi.c b/drivers/message/fusion/mptspi.c
index eabc4de5816cb..af0ce5611e4ac 100644
--- a/drivers/message/fusion/mptspi.c
+++ b/drivers/message/fusion/mptspi.c
@@ -52,7 +52,7 @@
#include <linux/kdev_t.h>
#include <linux/blkdev.h>
#include <linux/delay.h> /* for mdelay */
-#include <linux/interrupt.h> /* needed for in_interrupt() proto */
+#include <linux/interrupt.h>
#include <linux/reboot.h> /* notifier code */
#include <linux/workqueue.h>
#include <linux/raid_class.h>
--
2.29.2