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author | Brian Norris <briannorris@chromium.org> | 2016-10-26 16:29:20 -0700 |
---|---|---|
committer | Kalle Valo <kvalo@codeaurora.org> | 2016-11-18 13:23:12 +0200 |
commit | 66b9c182538e2ed11d31120e853321e4ea6f3e5a (patch) | |
tree | c6204e3f6ee702205d7c301f03fe0977e668490b /drivers/net/wireless/marvell | |
parent | 14e5e937592697d830537b7f6a59d45a6aa3d51b (diff) | |
download | op-kernel-dev-66b9c182538e2ed11d31120e853321e4ea6f3e5a.zip op-kernel-dev-66b9c182538e2ed11d31120e853321e4ea6f3e5a.tar.gz |
mwifiex: don't do unbalanced free()'ing in cleanup_if()
The cleanup_if() callback is the inverse of init_if(). We allocate our
'card' interface structure in the probe() function, but we free it in
cleanup_if(). That gives a few problems:
(a) we leak this memory if probe() fails before we reach init_if()
(b) we can't safely utilize 'card' after cleanup_if() -- namely, in
remove() or suspend(), both of which might race with the cleanup
paths in our asynchronous FW initialization path
Solution: just use devm_kzalloc(), which will free this structure
properly when the device is removed -- and drop the set_drvdata(...,
NULL), since the driver core does this for us. This also removes the
temptation to use drvdata == NULL as a hack for checking if the device
has been "cleaned up."
I *do* leave the set_drvdata(..., NULL) for the hacky SDIO
mwifiex_recreate_adapter(), since the device core won't be able to clear
that one for us.
Signed-off-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Diffstat (limited to 'drivers/net/wireless/marvell')
-rw-r--r-- | drivers/net/wireless/marvell/mwifiex/pcie.c | 5 | ||||
-rw-r--r-- | drivers/net/wireless/marvell/mwifiex/sdio.c | 16 | ||||
-rw-r--r-- | drivers/net/wireless/marvell/mwifiex/usb.c | 7 |
3 files changed, 12 insertions, 16 deletions
diff --git a/drivers/net/wireless/marvell/mwifiex/pcie.c b/drivers/net/wireless/marvell/mwifiex/pcie.c index 063c707..3047c1a 100644 --- a/drivers/net/wireless/marvell/mwifiex/pcie.c +++ b/drivers/net/wireless/marvell/mwifiex/pcie.c @@ -189,7 +189,7 @@ static int mwifiex_pcie_probe(struct pci_dev *pdev, pr_debug("info: vendor=0x%4.04X device=0x%4.04X rev=%d\n", pdev->vendor, pdev->device, pdev->revision); - card = kzalloc(sizeof(struct pcie_service_card), GFP_KERNEL); + card = devm_kzalloc(&pdev->dev, sizeof(*card), GFP_KERNEL); if (!card) return -ENOMEM; @@ -2815,7 +2815,6 @@ err_req_region0: err_set_dma_mask: pci_disable_device(pdev); err_enable_dev: - pci_set_drvdata(pdev, NULL); return ret; } @@ -2849,9 +2848,7 @@ static void mwifiex_pcie_cleanup(struct mwifiex_adapter *adapter) pci_disable_device(pdev); pci_release_region(pdev, 2); pci_release_region(pdev, 0); - pci_set_drvdata(pdev, NULL); } - kfree(card); } static int mwifiex_pcie_request_irq(struct mwifiex_adapter *adapter) diff --git a/drivers/net/wireless/marvell/mwifiex/sdio.c b/drivers/net/wireless/marvell/mwifiex/sdio.c index 807af13..e25a7f0 100644 --- a/drivers/net/wireless/marvell/mwifiex/sdio.c +++ b/drivers/net/wireless/marvell/mwifiex/sdio.c @@ -160,7 +160,7 @@ mwifiex_sdio_probe(struct sdio_func *func, const struct sdio_device_id *id) pr_debug("info: vendor=0x%4.04X device=0x%4.04X class=%d function=%d\n", func->vendor, func->device, func->class, func->num); - card = kzalloc(sizeof(struct sdio_mmc_card), GFP_KERNEL); + card = devm_kzalloc(&func->dev, sizeof(*card), GFP_KERNEL); if (!card) return -ENOMEM; @@ -193,7 +193,7 @@ mwifiex_sdio_probe(struct sdio_func *func, const struct sdio_device_id *id) if (ret) { dev_err(&func->dev, "failed to enable function\n"); - goto err_free; + return ret; } /* device tree node parsing and platform specific configuration*/ @@ -218,8 +218,6 @@ err_disable: sdio_claim_host(func); sdio_disable_func(func); sdio_release_host(func); -err_free: - kfree(card); return ret; } @@ -2248,8 +2246,6 @@ static void mwifiex_cleanup_sdio(struct mwifiex_adapter *adapter) kfree(card->mpa_rx.len_arr); kfree(card->mpa_tx.buf); kfree(card->mpa_rx.buf); - sdio_set_drvdata(card->func, NULL); - kfree(card); } /* @@ -2299,6 +2295,14 @@ static void mwifiex_recreate_adapter(struct sdio_mmc_card *card) mwifiex_sdio_remove(func); + /* + * Normally, we would let the driver core take care of releasing these. + * But we're not letting the driver core handle this one. See above + * TODO. + */ + sdio_set_drvdata(func, NULL); + devm_kfree(&func->dev, card); + /* power cycle the adapter */ sdio_claim_host(func); mmc_hw_reset(func->card->host); diff --git a/drivers/net/wireless/marvell/mwifiex/usb.c b/drivers/net/wireless/marvell/mwifiex/usb.c index 73eb084..57ed834 100644 --- a/drivers/net/wireless/marvell/mwifiex/usb.c +++ b/drivers/net/wireless/marvell/mwifiex/usb.c @@ -382,7 +382,7 @@ static int mwifiex_usb_probe(struct usb_interface *intf, struct usb_card_rec *card; u16 id_vendor, id_product, bcd_device, bcd_usb; - card = kzalloc(sizeof(struct usb_card_rec), GFP_KERNEL); + card = devm_kzalloc(&intf->dev, sizeof(*card), GFP_KERNEL); if (!card) return -ENOMEM; @@ -480,7 +480,6 @@ static int mwifiex_usb_probe(struct usb_interface *intf, if (ret) { pr_err("%s: mwifiex_add_card failed: %d\n", __func__, ret); usb_reset_device(udev); - kfree(card); return ret; } @@ -630,11 +629,7 @@ static void mwifiex_usb_disconnect(struct usb_interface *intf) "%s: removing card\n", __func__); mwifiex_remove_card(adapter, &add_remove_card_sem); - usb_set_intfdata(intf, NULL); usb_put_dev(interface_to_usbdev(intf)); - kfree(card); - - return; } static struct usb_driver mwifiex_usb_driver = { |