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dmatest: make dmatest threads freezable

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Making dmatest threads freezable allows its use for system PM testing.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Guennadi Liakhovetski 2011-08-18 16:50:51 +02:00 • committed by Vinod Koul
commit 981ed70d8e
1 changed files with 15 additions and 2 deletions
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17
drivers/dma/dmatest.c
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@ -10,6 +10,7 @@
#include <linux/delay.h> #include <linux/delay.h>
#include <linux/dma-mapping.h> #include <linux/dma-mapping.h>
#include <linux/dmaengine.h> #include <linux/dmaengine.h>
#include <linux/freezer.h>
#include <linux/init.h> #include <linux/init.h>
#include <linux/kthread.h> #include <linux/kthread.h>
#include <linux/module.h> #include <linux/module.h>
@ -251,6 +252,7 @@ static int dmatest_func(void *data)
int i; int i;
thread_name = current->comm; thread_name = current->comm;
set_freezable_with_signal();
ret = -ENOMEM; ret = -ENOMEM;
@ -305,7 +307,8 @@ static int dmatest_func(void *data)
dma_addr_t dma_srcs[src_cnt]; dma_addr_t dma_srcs[src_cnt];
dma_addr_t dma_dsts[dst_cnt]; dma_addr_t dma_dsts[dst_cnt];
struct completion cmp; struct completion cmp;
unsigned long tmo = msecs_to_jiffies(timeout); unsigned long start, tmo, end = 0 /* compiler... */;
bool reload = true;
u8 align = 0; u8 align = 0;
total_tests++; total_tests++;
@ -404,7 +407,17 @@ static int dmatest_func(void *data)
} }
dma_async_issue_pending(chan); dma_async_issue_pending(chan);
tmo = wait_for_completion_timeout(&cmp, tmo); do {
start = jiffies;
if (reload)
end = start + msecs_to_jiffies(timeout);
else if (end <= start)
end = start + 1;
tmo = wait_for_completion_interruptible_timeout(&cmp,
end - start);
reload = try_to_freeze();
} while (tmo == -ERESTARTSYS);
status = dma_async_is_tx_complete(chan, cookie, NULL, NULL); status = dma_async_is_tx_complete(chan, cookie, NULL, NULL);
if (tmo == 0) { if (tmo == 0) {