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ag71xx: fix a memory corruption bug that happens if you flood the interface with packets while it's being brought down

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fixes boot time crashes under load reported by matteo

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@22054 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
Felix Fietkau
2010-07-04 01:31:33 +00:00
parent 2f0e4377bd
commit d7965cb882
1 changed files with 6 additions and 0 deletions
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6
target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c
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@@ -454,6 +454,12 @@ static void ag71xx_dma_reset(struct ag71xx *ag)
ag71xx_wr(ag, AG71XX_REG_RX_CTRL, 0);
ag71xx_wr(ag, AG71XX_REG_TX_CTRL, 0);
/*
* give the hardware some time to really stop all rx/tx activity
* clearing the descriptors too early causes random memory corruption
*/
mdelay(1);
/* clear descriptor addresses */
ag71xx_wr(ag, AG71XX_REG_TX_DESC, 0);
ag71xx_wr(ag, AG71XX_REG_RX_DESC, 0);