From: Gavin Shan Date: Mon, 17 Sep 2012 04:34:27 +0000 (+0000) Subject: powerpc/eeh: Lock module while handling EEH event X-Git-Tag: v3.6.9~3 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=db9d0c8d25d316f38fbd7e0c683e30041bf4cc09;p=karo-tx-linux.git powerpc/eeh: Lock module while handling EEH event commit feadf7c0a1a7c08c74bebb4a13b755f8c40e3bbc upstream. The EEH core is talking with the PCI device driver to determine the action (purely reset, or PCI device removal). During the period, the driver might be unloaded and in turn causes kernel crash as follows: EEH: Detected PCI bus error on PHB#4-PE#10000 EEH: This PCI device has failed 3 times in the last hour lpfc 0004:01:00.0: 0:2710 PCI channel disable preparing for reset Unable to handle kernel paging request for data at address 0x00000490 Faulting instruction address: 0xd00000000e682c90 cpu 0x1: Vector: 300 (Data Access) at [c000000fc75ffa20] pc: d00000000e682c90: .lpfc_io_error_detected+0x30/0x240 [lpfc] lr: d00000000e682c8c: .lpfc_io_error_detected+0x2c/0x240 [lpfc] sp: c000000fc75ffca0 msr: 8000000000009032 dar: 490 dsisr: 40000000 current = 0xc000000fc79b88b0 paca = 0xc00000000edb0380 softe: 0 irq_happened: 0x00 pid = 3386, comm = eehd enter ? for help [c000000fc75ffca0] c000000fc75ffd30 (unreliable) [c000000fc75ffd30] c00000000004fd3c .eeh_report_error+0x7c/0xf0 [c000000fc75ffdc0] c00000000004ee00 .eeh_pe_dev_traverse+0xa0/0x180 [c000000fc75ffe70] c00000000004ffd8 .eeh_handle_event+0x68/0x300 [c000000fc75fff00] c0000000000503a0 .eeh_event_handler+0x130/0x1a0 [c000000fc75fff90] c000000000020138 .kernel_thread+0x54/0x70 1:mon> The patch increases the reference of the corresponding driver modules while EEH core does the negotiation with PCI device driver so that the corresponding driver modules can't be unloaded during the period and we're safe to refer the callbacks. Reported-by: Alexey Kardashevskiy Signed-off-by: Gavin Shan Signed-off-by: Benjamin Herrenschmidt [ herton: backported for 3.5, adjusted driver assignments, return 0 instead of NULL, assume dev is not NULL ] Signed-off-by: Herton Ronaldo Krzesinski Cc: Ben Hutchings Signed-off-by: Greg Kroah-Hartman --- diff --git a/arch/powerpc/platforms/pseries/eeh_driver.c b/arch/powerpc/platforms/pseries/eeh_driver.c index baf92cd9dfab..041e28d0e702 100644 --- a/arch/powerpc/platforms/pseries/eeh_driver.c +++ b/arch/powerpc/platforms/pseries/eeh_driver.c @@ -25,6 +25,7 @@ #include #include #include +#include #include #include #include @@ -47,6 +48,41 @@ static inline const char *eeh_pcid_name(struct pci_dev *pdev) return ""; } +/** + * eeh_pcid_get - Get the PCI device driver + * @pdev: PCI device + * + * The function is used to retrieve the PCI device driver for + * the indicated PCI device. Besides, we will increase the reference + * of the PCI device driver to prevent that being unloaded on + * the fly. Otherwise, kernel crash would be seen. + */ +static inline struct pci_driver *eeh_pcid_get(struct pci_dev *pdev) +{ + if (!pdev || !pdev->driver) + return NULL; + + if (!try_module_get(pdev->driver->driver.owner)) + return NULL; + + return pdev->driver; +} + +/** + * eeh_pcid_put - Dereference on the PCI device driver + * @pdev: PCI device + * + * The function is called to do dereference on the PCI device + * driver of the indicated PCI device. + */ +static inline void eeh_pcid_put(struct pci_dev *pdev) +{ + if (!pdev || !pdev->driver) + return; + + module_put(pdev->driver->driver.owner); +} + #if 0 static void print_device_node_tree(struct pci_dn *pdn, int dent) { @@ -126,18 +162,20 @@ static void eeh_enable_irq(struct pci_dev *dev) static int eeh_report_error(struct pci_dev *dev, void *userdata) { enum pci_ers_result rc, *res = userdata; - struct pci_driver *driver = dev->driver; + struct pci_driver *driver; dev->error_state = pci_channel_io_frozen; - if (!driver) - return 0; + driver = eeh_pcid_get(dev); + if (!driver) return 0; eeh_disable_irq(dev); if (!driver->err_handler || - !driver->err_handler->error_detected) + !driver->err_handler->error_detected) { + eeh_pcid_put(dev); return 0; + } rc = driver->err_handler->error_detected(dev, pci_channel_io_frozen); @@ -145,6 +183,7 @@ static int eeh_report_error(struct pci_dev *dev, void *userdata) if (rc == PCI_ERS_RESULT_NEED_RESET) *res = rc; if (*res == PCI_ERS_RESULT_NONE) *res = rc; + eeh_pcid_put(dev); return 0; } @@ -160,12 +199,16 @@ static int eeh_report_error(struct pci_dev *dev, void *userdata) static int eeh_report_mmio_enabled(struct pci_dev *dev, void *userdata) { enum pci_ers_result rc, *res = userdata; - struct pci_driver *driver = dev->driver; + struct pci_driver *driver; + + driver = eeh_pcid_get(dev); + if (!driver) return 0; - if (!driver || - !driver->err_handler || - !driver->err_handler->mmio_enabled) + if (!driver->err_handler || + !driver->err_handler->mmio_enabled) { + eeh_pcid_put(dev); return 0; + } rc = driver->err_handler->mmio_enabled(dev); @@ -173,6 +216,7 @@ static int eeh_report_mmio_enabled(struct pci_dev *dev, void *userdata) if (rc == PCI_ERS_RESULT_NEED_RESET) *res = rc; if (*res == PCI_ERS_RESULT_NONE) *res = rc; + eeh_pcid_put(dev); return 0; } @@ -189,18 +233,20 @@ static int eeh_report_mmio_enabled(struct pci_dev *dev, void *userdata) static int eeh_report_reset(struct pci_dev *dev, void *userdata) { enum pci_ers_result rc, *res = userdata; - struct pci_driver *driver = dev->driver; - - if (!driver) - return 0; + struct pci_driver *driver; dev->error_state = pci_channel_io_normal; + driver = eeh_pcid_get(dev); + if (!driver) return 0; + eeh_enable_irq(dev); if (!driver->err_handler || - !driver->err_handler->slot_reset) + !driver->err_handler->slot_reset) { + eeh_pcid_put(dev); return 0; + } rc = driver->err_handler->slot_reset(dev); if ((*res == PCI_ERS_RESULT_NONE) || @@ -208,6 +254,7 @@ static int eeh_report_reset(struct pci_dev *dev, void *userdata) if (*res == PCI_ERS_RESULT_DISCONNECT && rc == PCI_ERS_RESULT_NEED_RESET) *res = rc; + eeh_pcid_put(dev); return 0; } @@ -222,21 +269,24 @@ static int eeh_report_reset(struct pci_dev *dev, void *userdata) */ static int eeh_report_resume(struct pci_dev *dev, void *userdata) { - struct pci_driver *driver = dev->driver; + struct pci_driver *driver; dev->error_state = pci_channel_io_normal; - if (!driver) - return 0; + driver = eeh_pcid_get(dev); + if (!driver) return 0; eeh_enable_irq(dev); if (!driver->err_handler || - !driver->err_handler->resume) + !driver->err_handler->resume) { + eeh_pcid_put(dev); return 0; + } driver->err_handler->resume(dev); + eeh_pcid_put(dev); return 0; } @@ -250,21 +300,24 @@ static int eeh_report_resume(struct pci_dev *dev, void *userdata) */ static int eeh_report_failure(struct pci_dev *dev, void *userdata) { - struct pci_driver *driver = dev->driver; + struct pci_driver *driver; dev->error_state = pci_channel_io_perm_failure; - if (!driver) - return 0; + driver = eeh_pcid_get(dev); + if (!driver) return 0; eeh_disable_irq(dev); if (!driver->err_handler || - !driver->err_handler->error_detected) + !driver->err_handler->error_detected) { + eeh_pcid_put(dev); return 0; + } driver->err_handler->error_detected(dev, pci_channel_io_perm_failure); + eeh_pcid_put(dev); return 0; }