net: ethernet: ti: cpdma: fix lockup in cpdma_ctlr_destroy()

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Fix deadlock in cpdma_ctlr_destroy() which is triggered now on
cpsw module removal:
 cpsw_remove()
 - cpdma_ctlr_destroy()
   - spin_lock_irqsave(&ctlr->lock, flags)
   - cpdma_ctlr_stop()
     - spin_lock_irqsave(&ctlr->lock, flags);
   - cpdma_chan_destroy()
     - spin_lock_irqsave(&ctlr->lock, flags);

The issue has not been observed before because CPDMA channels have
been destroyed manually by CPSW until commit d941ebe88a ("net:
ethernet: ti: cpsw: use destroy ctlr to destroy channels") was merged.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Reviewed-by: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

This commit is contained in:

Grygorii Strashko 2016-07-28 20:50:34 +03:00 • committed by David S. Miller

parent c882219ae4

commit fccd5badb8

1 changed files with 0 additions and 3 deletions

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drivers/net/ethernet/ti/davinci_cpdma.c

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