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Date:	Fri, 11 Dec 2015 11:54:48 +0000 (UTC)
From:	Kalle Valo <kvalo@...eaurora.org>
To:	Uri Mashiach <uri.mashiach@...pulab.co.il>
Cc:	Luciano Coelho <luca@...lho.fi>, Eliad Peller <eliad@...ery.com>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	igor.grinberg@...pulab.co.il,
	Uri Mashiach <uri.mashiach@...pulab.co.il>
Subject: Re: [v2] wlcore/wl12xx: spi: fix oops on firmware load


> The maximum chunks used by the function is
> (SPI_AGGR_BUFFER_SIZE / WSPI_MAX_CHUNK_SIZE + 1).
> The original commands array had space for
> (SPI_AGGR_BUFFER_SIZE / WSPI_MAX_CHUNK_SIZE) commands.
> When the last chunk is used (len > 4 * WSPI_MAX_CHUNK_SIZE), the last
> command is stored outside the bounds of the commands array.
> 
> Oops 5 (page fault) is generated during current wl1271 firmware load
> attempt:
> 
> root@...ian-armhf:~# ifconfig wlan0 up
> [  294.312399] Unable to handle kernel paging request at virtual address
> 00203fc4
> [  294.320173] pgd = de528000
> [  294.323028] [00203fc4] *pgd=00000000
> [  294.326916] Internal error: Oops: 5 [#1] SMP ARM
> [  294.331789] Modules linked in: bnep rfcomm bluetooth ipv6 arc4 wl12xx
> wlcore mac80211 musb_dsps cfg80211 musb_hdrc usbcore usb_common
> wlcore_spi omap_rng rng_core musb_am335x omap_wdt cpufreq_dt thermal_sys
> hwmon
> [  294.351838] CPU: 0 PID: 1827 Comm: ifconfig Not tainted
> 4.2.0-00002-g3e9ad27-dirty #78
> [  294.360154] Hardware name: Generic AM33XX (Flattened Device Tree)
> [  294.366557] task: dc9d6d40 ti: de550000 task.ti: de550000
> [  294.372236] PC is at __spi_validate+0xa8/0x2ac
> [  294.376902] LR is at __spi_sync+0x78/0x210
> [  294.381200] pc : [<c049c760>]    lr : [<c049ebe0>]    psr: 60000013
> [  294.381200] sp : de551998  ip : de5519d8  fp : 00200000
> [  294.393242] r10: de551c8c  r9 : de5519d8  r8 : de3a9000
> [  294.398730] r7 : de3a9258  r6 : de3a9400  r5 : de551a48  r4 :
> 00203fbc
> [  294.405577] r3 : 00000000  r2 : 00000000  r1 : 00000000  r0 :
> de3a9000
> [  294.412420] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM
> Segment user
> [  294.419918] Control: 10c5387d  Table: 9e528019  DAC: 00000015
> [  294.425954] Process ifconfig (pid: 1827, stack limit = 0xde550218)
> [  294.432437] Stack: (0xde551998 to 0xde552000)
> 
> ...
> 
> [  294.883613] [<c049c760>] (__spi_validate) from [<c049ebe0>]
> (__spi_sync+0x78/0x210)
> [  294.891670] [<c049ebe0>] (__spi_sync) from [<bf036598>]
> (wl12xx_spi_raw_write+0xfc/0x148 [wlcore_spi])
> [  294.901661] [<bf036598>] (wl12xx_spi_raw_write [wlcore_spi]) from
> [<bf21c694>] (wlcore_boot_upload_firmware+0x1ec/0x458 [wlcore])
> [  294.914038] [<bf21c694>] (wlcore_boot_upload_firmware [wlcore]) from
> [<bf24532c>] (wl12xx_boot+0xc10/0xfac [wl12xx])
> [  294.925161] [<bf24532c>] (wl12xx_boot [wl12xx]) from [<bf20d5cc>]
> (wl1271_op_add_interface+0x5b0/0x910 [wlcore])
> [  294.936364] [<bf20d5cc>] (wl1271_op_add_interface [wlcore]) from
> [<bf15c4ac>] (ieee80211_do_open+0x44c/0xf7c [mac80211])
> [  294.947963] [<bf15c4ac>] (ieee80211_do_open [mac80211]) from
> [<c0537978>] (__dev_open+0xa8/0x110)
> [  294.957307] [<c0537978>] (__dev_open) from [<c0537bf8>]
> (__dev_change_flags+0x88/0x148)
> [  294.965713] [<c0537bf8>] (__dev_change_flags) from [<c0537cd0>]
> (dev_change_flags+0x18/0x48)
> [  294.974576] [<c0537cd0>] (dev_change_flags) from [<c05a55a0>]
> (devinet_ioctl+0x6b4/0x7d0)
> [  294.983191] [<c05a55a0>] (devinet_ioctl) from [<c0517040>]
> (sock_ioctl+0x1e4/0x2bc)
> [  294.991244] [<c0517040>] (sock_ioctl) from [<c017d378>]
> (do_vfs_ioctl+0x420/0x6b0)
> [  294.999208] [<c017d378>] (do_vfs_ioctl) from [<c017d674>]
> (SyS_ioctl+0x6c/0x7c)
> [  295.006880] [<c017d674>] (SyS_ioctl) from [<c000f4c0>]
> (ret_fast_syscall+0x0/0x54)
> [  295.014835] Code: e1550004 e2444034 0a00007d e5953018 (e5942008)
> [  295.021544] ---[ end trace 66ed188198f4e24e ]---
> 
> Signed-off-by: Uri Mashiach <uri.mashiach@...pulab.co.il>
> Acked-by: Igor Grinberg <grinberg@...pulab.co.il>
> Cc: stable@...r.kernel.org

Thanks, applied to wireless-drivers-next.git.

Kalle Valo
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