scsi: message: fusion: Remove in_interrupt() usage in mpt_config()

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these references are comments which are outdated and wrong.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().

Link: https://lore.kernel.org/r/[e-mail]
Cc: Sathya Prakash <[e-mail]>
Cc: Sreekanth Reddy <[e-mail]>
Cc: Suganath Prabu Subramani <[e-mail]>
Cc: [e-mail]
Reviewed-by: Daniel Wagner <[e-mail]>
Signed-off-by: Thomas Gleixner <[e-mail]>
Signed-off-by: Sebastian Andrzej Siewior <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/message/fusion/mptbase.c

···
 #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>
···
  *		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)
  */
···
 	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);

drivers/message/fusion/mptfc.c

···
 #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>

drivers/message/fusion/mptscsih.c

···
 #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>
 

drivers/message/fusion/mptspi.c

···
 #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>