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When driver fail to reset card ah->curchan value stay NULL. When later driver try to update tx power it oops by using ah->curchan (calltrace is shown below). This problem were reported at various places and for some it was fixed by making ath9k_hw_chip_reset() do not fail. I have this bug report on some oldish RHEL kernel with AR9285, however it's hard to debug where reset fail when kernel OOPS, so I think this patch should be applied. Hopefully ah->curchan is not used unconditionally on other places until is initialized on ath9k_config(). ath: phy0: Chip reset failed ath: phy0: Unable to reset hardware; reset status -22 (freq 2412 MHz) BUG: unable to handle kernel NULL pointer dereference at (null) IP: [<f8a35585>] ath9k_hw_set_txpowerlimit+0x25/0x80 [ath9k_hw] Oops: 0000 [#1] SMP <snip> Call Trace: [<f8aac1aa>] ? ath9k_cmn_update_txpow+0x1a/0x30 [ath9k_common] [<f8cf4f4e>] ? ath_complete_reset+0x4e/0x130 [ath9k] [<f8cf54d7>] ? ath9k_start+0x127/0x1e0 [ath9k] [<f8c2e52f>] ? ieee80211_do_open+0x30f/0x910 [mac80211] [<c07bd96d>] ? dev_open+0x8d/0xf0 Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com> Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.