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scst: Avoid that a high I/O load prevents activity to be suspended

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Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
This commit is contained in:
Bart Van Assche
2015-05-02 10:05:35 +02:00
parent ec5e922002
commit d22ba32ea1
1 changed files with 9 additions and 0 deletions
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9
scst/src/scst_priv.h
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@@ -21,6 +21,7 @@
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/delay.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 2, 0)
#include <linux/export.h>
#endif
@@ -691,6 +692,14 @@ bool __scst_check_blocked_dev(struct scst_cmd *cmd);
static inline atomic_t *scst_get(void)
{
atomic_t *a;
/*
* Avoid that a high I/O load prevents activity to be suspended. See
* also http://sourceforge.net/p/scst/mailman/message/34074831/.
*/
if (unlikely(test_bit(SCST_FLAG_SUSPENDING, &scst_flags)))
mdelay(100);
/*
* We don't mind if we because of preemption inc counter from another
* CPU as soon in the majority cases we will the correct one.