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ath9k_hw: Fix invalid MCI GPM index access/caching

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There is a possibility that AR_MCI_GPM_1 register can
return 0xdeadbeef and this results in caching of invalid
GPM index in ar9003_mci_is_gpm_valid. Ensure we
have appropriate checks to avoid this.

Cc: xijin luo <xijin@qca.qualcomm.com>
Signed-off-by: Mohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Mohammed Shafi Shajakhan 2012-09-04 19:33:32 +05:30 committed by John W. Linville
parent af2c8ffe56
commit 90be994cd0
1 changed files with 8 additions and 0 deletions
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8
drivers/net/wireless/ath/ath9k/ar9003_mci.c
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@ -1321,6 +1321,10 @@ u32 ar9003_mci_get_next_gpm_offset(struct ath_hw *ah, bool first, u32 *more)
if (first) {
gpm_ptr = MS(REG_READ(ah, AR_MCI_GPM_1), AR_MCI_GPM_WRITE_PTR);
if (gpm_ptr >= mci->gpm_len)
gpm_ptr = 0;
mci->gpm_idx = gpm_ptr;
return gpm_ptr;
}
@ -1365,6 +1369,10 @@ u32 ar9003_mci_get_next_gpm_offset(struct ath_hw *ah, bool first, u32 *more)
more_gpm = MCI_GPM_NOMORE;
temp_index = mci->gpm_idx;
if (temp_index >= mci->gpm_len)
temp_index = 0;
mci->gpm_idx++;
if (mci->gpm_idx >= mci->gpm_len)