mac80211: backport brcmfmac fix for sdio sg table alloc crash

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

SVN-Revision: 48781

package/kernel/mac80211/patches/309-02-brcmfmac-fix-sdio-sg-table-alloc-crash.patch

@@ -0,0 +1,118 @@
+From: Hante Meuleman <meuleman@broadcom.com>
+Date: Tue, 19 Jan 2016 12:39:24 +0100
+Subject: [PATCH] brcmfmac: fix sdio sg table alloc crash
+
+With commit 7d34b0560567 ("brcmfmac: Move all module parameters to
+one place") a bug was introduced causing a null pointer exception.
+This patch fixes the bug by initializing the sg table till after
+the settings have been initialized.
+
+Fixes: 7d34b0560567 ("brcmfmac: Move all module parameters to one place")
+Reported-by: Marc Zyngier <marc.zyngier@arm.com>
+Tested-by: Marc Zyngier <marc.zyngier@arm.com>
+Reviewed-by: Arend Van Spriel <arend@broadcom.com>
+Reviewed-by: Franky (Zhenhui) Lin <frankyl@broadcom.com>
+Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
+Signed-off-by: Hante Meuleman <meuleman@broadcom.com>
+Signed-off-by: Arend van Spriel <arend@broadcom.com>
+Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
+---
+
+--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
++++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
+@@ -879,11 +879,24 @@ int brcmf_sdiod_abort(struct brcmf_sdio_
+ 	return 0;
+ }
+ 
+-static void brcmf_sdiod_sgtable_alloc(struct brcmf_sdio_dev *sdiodev)
++void brcmf_sdiod_sgtable_alloc(struct brcmf_sdio_dev *sdiodev)
+ {
++	struct sdio_func *func;
++	struct mmc_host *host;
++	uint max_blocks;
+ 	uint nents;
+ 	int err;
+ 
++	func = sdiodev->func[2];
++	host = func->card->host;
++	sdiodev->sg_support = host->max_segs > 1;
++	max_blocks = min_t(uint, host->max_blk_count, 511u);
++	sdiodev->max_request_size = min_t(uint, host->max_req_size,
++					  max_blocks * func->cur_blksize);
++	sdiodev->max_segment_count = min_t(uint, host->max_segs,
++					   SG_MAX_SINGLE_ALLOC);
++	sdiodev->max_segment_size = host->max_seg_size;
++
+ 	if (!sdiodev->sg_support)
+ 		return;
+ 
+@@ -1021,9 +1034,6 @@ static void brcmf_sdiod_host_fixup(struc
+ 
+ static int brcmf_sdiod_probe(struct brcmf_sdio_dev *sdiodev)
+ {
+-	struct sdio_func *func;
+-	struct mmc_host *host;
+-	uint max_blocks;
+ 	int ret = 0;
+ 
+ 	sdiodev->num_funcs = 2;
+@@ -1054,26 +1064,6 @@ static int brcmf_sdiod_probe(struct brcm
+ 		goto out;
+ 	}
+ 
+-	/*
+-	 * determine host related variables after brcmf_sdiod_probe()
+-	 * as func->cur_blksize is properly set and F2 init has been
+-	 * completed successfully.
+-	 */
+-	func = sdiodev->func[2];
+-	host = func->card->host;
+-	sdiodev->sg_support = host->max_segs > 1;
+-	max_blocks = min_t(uint, host->max_blk_count, 511u);
+-	sdiodev->max_request_size = min_t(uint, host->max_req_size,
+-					  max_blocks * func->cur_blksize);
+-	sdiodev->max_segment_count = min_t(uint, host->max_segs,
+-					   SG_MAX_SINGLE_ALLOC);
+-	sdiodev->max_segment_size = host->max_seg_size;
+-
+-	/* allocate scatter-gather table. sg support
+-	 * will be disabled upon allocation failure.
+-	 */
+-	brcmf_sdiod_sgtable_alloc(sdiodev);
+-
+ 	ret = brcmf_sdiod_freezer_attach(sdiodev);
+ 	if (ret)
+ 		goto out;
+@@ -1084,7 +1074,7 @@ static int brcmf_sdiod_probe(struct brcm
+ 		ret = -ENODEV;
+ 		goto out;
+ 	}
+-	brcmf_sdiod_host_fixup(host);
++	brcmf_sdiod_host_fixup(sdiodev->func[2]->card->host);
+ out:
+ 	if (ret)
+ 		brcmf_sdiod_remove(sdiodev);
+--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
++++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
+@@ -4114,6 +4114,11 @@ struct brcmf_sdio *brcmf_sdio_probe(stru
+ 		goto fail;
+ 	}
+ 
++	/* allocate scatter-gather table. sg support
++	 * will be disabled upon allocation failure.
++	 */
++	brcmf_sdiod_sgtable_alloc(bus->sdiodev);
++
+ 	/* Query the F2 block size, set roundup accordingly */
+ 	bus->blocksize = bus->sdiodev->func[2]->cur_blksize;
+ 	bus->roundup = min(max_roundup, bus->blocksize);
+--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.h
++++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.h
+@@ -342,6 +342,7 @@ int brcmf_sdiod_ramrw(struct brcmf_sdio_
+ 
+ /* Issue an abort to the specified function */
+ int brcmf_sdiod_abort(struct brcmf_sdio_dev *sdiodev, uint fn);
++void brcmf_sdiod_sgtable_alloc(struct brcmf_sdio_dev *sdiodev);
+ void brcmf_sdiod_change_state(struct brcmf_sdio_dev *sdiodev,
+ 			      enum brcmf_sdiod_state state);
+ #ifdef CONFIG_PM_SLEEP