/* * Copyright (C) 2011 Freescale Semiconductor, Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ #ifndef __DW_HDMI__ #define __DW_HDMI__ #include struct dw_hdmi; enum { DW_HDMI_RES_8, DW_HDMI_RES_10, DW_HDMI_RES_12, DW_HDMI_RES_MAX, }; enum dw_hdmi_devtype { IMX6Q_HDMI, IMX6DL_HDMI, RK3288_HDMI, }; struct dw_hdmi_mpll_config { unsigned long mpixelclock; struct { u16 cpce; u16 gmp; } res[DW_HDMI_RES_MAX]; }; struct dw_hdmi_curr_ctrl { unsigned long mpixelclock; u16 curr[DW_HDMI_RES_MAX]; }; struct dw_hdmi_phy_config { unsigned long mpixelclock; u16 sym_ctr; /*clock symbol and transmitter control*/ u16 term; /*transmission termination value*/ u16 vlev_ctr; /* voltage level control */ }; struct dw_hdmi_plat_data { enum dw_hdmi_devtype dev_type; const struct dw_hdmi_mpll_config *mpll_cfg; const struct dw_hdmi_curr_ctrl *cur_ctr; const struct dw_hdmi_phy_config *phy_config; enum drm_mode_status (*mode_valid)(struct drm_connector *connector, struct drm_display_mode *mode); }; void dw_hdmi_unbind(struct device *dev, struct device *master, void *data); int dw_hdmi_bind(struct device *dev, struct device *master, void *data, struct drm_encoder *encoder, struct resource *iores, int irq, const struct dw_hdmi_plat_data *plat_data); void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int rate); void dw_hdmi_audio_enable(struct dw_hdmi *hdmi); void dw_hdmi_audio_disable(struct dw_hdmi *hdmi); #endif /* __IMX_HDMI_H__ */ ='/cgit.cgi/linux/net-next.git/tree/?id=22b331c9e0a345126708af60f7d00d38b53db70b'>treecommitdiff
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authorNetanel Belgazal <netanel@annapurnalabs.com>2017-02-09 15:21:31 +0200
committerDavid S. Miller <davem@davemloft.net>2017-02-09 22:27:06 -0500
commit22b331c9e0a345126708af60f7d00d38b53db70b (patch)
treef9aef62ac8900976012a712d75b6d681382b62dc
parent422e21e7619bb8751aa1cd32a9b671b1baaf3d18 (diff)
net/ena: fix NULL dereference when removing the driver after device reset failed
If for some reason the device stops responding, and the device reset failes to recover the device, the mmio register read data structure will not be reinitialized. On driver removal, the driver will also try to reset the device, but this time the mmio data structure will be NULL. To solve this issue, perform the device reset in the remove function only if the device is runnig. Crash log 54.240382] BUG: unable to handle kernel NULL pointer dereference at (null) [ 54.244186] IP: [<ffffffffc067de5a>] ena_com_reg_bar_read32+0x8a/0x180 [ena_drv] [ 54.244186] PGD 0 [ 54.244186] Oops: 0002 [#1] SMP [ 54.244186] Modules linked in: ena_drv(OE-) snd_hda_codec_generic kvm_intel kvm crct10dif_pclmul ppdev crc32_pclmul ghash_clmulni_intel aesni_intel snd_hda_intel aes_x86_64 snd_hda_controller lrw gf128mul cirrus glue_helper ablk_helper ttm snd_hda_codec drm_kms_helper cryptd snd_hwdep drm snd_pcm pvpanic snd_timer syscopyarea sysfillrect snd parport_pc sysimgblt serio_raw soundcore i2c_piix4 mac_hid lp parport psmouse floppy [ 54.244186] CPU: 5 PID: 1841 Comm: rmmod Tainted: G OE 3.16.0-031600-generic #201408031935 [ 54.244186] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 54.244186] task: ffff880135852880 ti: ffff8800bb640000 task.ti: ffff8800bb640000 [ 54.244186] RIP: 0010:[<ffffffffc067de5a>] [<ffffffffc067de5a>] ena_com_reg_bar_read32+0x8a/0x180 [ena_drv] [ 54.244186] RSP: 0018:ffff8800bb643d50 EFLAGS: 00010083 [ 54.244186] RAX: 000000000000deb0 RBX: 0000000000030d40 RCX: 0000000000000003 [ 54.244186] RDX: 0000000000000202 RSI: 0000000000000058 RDI: ffffc90000775104 [ 54.244186] RBP: ffff8800bb643d88 R08: 0000000000000000 R09: cf00000000000000 [ 54.244186] R10: 0000000fffffffe0 R11: 0000000000000001 R12: 0000000000000000 [ 54.244186] R13: ffffc90000765000 R14: ffffc90000775104 R15: 00007fca1fa98090 [ 54.244186] FS: 00007fca1f1bd740(0000) GS:ffff88013fd40000(0000) knlGS:0000000000000000 [ 54.244186] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 54.244186] CR2: 0000000000000000 CR3: 00000000b9cf6000 CR4: 00000000001406e0 [ 54.244186] Stack: [ 54.244186] 0000000000000202 0000005800000286 ffffc90000765000 ffffc90000765000 [ 54.244186] ffff880135f6b000 ffff8800b9360000 00007fca1fa98090 ffff8800bb643db8 [ 54.244186] ffffffffc0680b3d ffff8800b93608c0 ffffc90000765000 ffff880135f6b000 [ 54.244186] Call Trace: [ 54.244186] [<ffffffffc0680b3d>] ena_com_dev_reset+0x1d/0x1b0 [ena_drv] [ 54.244186] [<ffffffffc0678497>] ena_remove+0xa7/0x130 [ena_drv] [ 54.244186] [<ffffffff813d4df6>] pci_device_remove+0x46/0xc0 [ 54.244186] [<ffffffff814c3b7f>] __device_release_driver+0x7f/0xf0 [ 54.244186] [<ffffffff814c4738>] driver_detach+0xc8/0xd0 [ 54.244186] [<ffffffff814c3969>] bus_remove_driver+0x59/0xd0 [ 54.244186] [<ffffffff814c4fde>] driver_unregister+0x2e/0x60 [ 54.244186] [<ffffffff810f0a80>] ? show_refcnt+0x40/0x40 [ 54.244186] [<ffffffff813d4ec3>] pci_unregister_driver+0x23/0xa0 [ 54.244186] [<ffffffffc068413f>] ena_cleanup+0x10/0xed1 [ena_drv] [ 54.244186] [<ffffffff810f3a47>] SyS_delete_module+0x157/0x1e0 [ 54.244186] [<ffffffff81014fb7>] ? do_notify_resume+0xc7/0xd0 [ 54.244186] [<ffffffff81793fad>] system_call_fastpath+0x1a/0x1f [ 54.244186] Code: c3 4d 8d b5 04 01 01 00 4c 89 f7 e8 e1 5a 11 c1 48 89 45 c8 41 0f b7 85 00 01 01 00 8d 48 01 66 2d 52 21 66 41 89 8d 00 01 01 00 <66> 41 89 04 24 0f b7 45 d4 89 45 d0 89 c1 41 0f b7 85 00 01 01 [ 54.244186] RIP [<ffffffffc067de5a>] ena_com_reg_bar_read32+0x8a/0x180 [ena_drv] [ 54.244186] RSP <ffff8800bb643d50> [ 54.244186] CR2: 0000000000000000 [ 54.244186] ---[ end trace 18dd9889b6497810 ]--- Signed-off-by: Netanel Belgazal <netanel@annapurnalabs.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat
-rw-r--r--drivers/net/ethernet/amazon/ena/ena_netdev.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c