4.9-stable review patch. If anyone has any objections, please let me know.
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From: Michal Suchanek msuchanek@suse.de
commit 98b8cd7f75643e0a442d7a4c1cef2c9d53b7e92b upstream.
- log an error message when registration fails and no error code listed in the switch is returned - translate the hv error code to posix error code and return it from fw_register - return the posix error code from fw_register to the process writing to sysfs - return EEXIST on re-registration - return success on deregistration when fadump is not registered - return ENODEV when no memory is reserved for fadump
Signed-off-by: Michal Suchanek msuchanek@suse.de Tested-by: Hari Bathini hbathini@linux.vnet.ibm.com [mpe: Use pr_err() to shrink the error print] Signed-off-by: Michael Ellerman mpe@ellerman.id.au Cc: Kleber Sacilotto de Souza kleber.souza@canonical.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/powerpc/kernel/fadump.c | 23 +++++++++++++++-------- 1 file changed, 15 insertions(+), 8 deletions(-)
--- a/arch/powerpc/kernel/fadump.c +++ b/arch/powerpc/kernel/fadump.c @@ -365,9 +365,9 @@ static int __init early_fadump_reserve_m } early_param("fadump_reserve_mem", early_fadump_reserve_mem);
-static void register_fw_dump(struct fadump_mem_struct *fdm) +static int register_fw_dump(struct fadump_mem_struct *fdm) { - int rc; + int rc, err; unsigned int wait_time;
pr_debug("Registering for firmware-assisted kernel dump...\n"); @@ -384,7 +384,11 @@ static void register_fw_dump(struct fadu
} while (wait_time);
+ err = -EIO; switch (rc) { + default: + pr_err("Failed to register. Unknown Error(%d).\n", rc); + break; case -1: printk(KERN_ERR "Failed to register firmware-assisted kernel" " dump. Hardware Error(%d).\n", rc); @@ -392,18 +396,22 @@ static void register_fw_dump(struct fadu case -3: printk(KERN_ERR "Failed to register firmware-assisted kernel" " dump. Parameter Error(%d).\n", rc); + err = -EINVAL; break; case -9: printk(KERN_ERR "firmware-assisted kernel dump is already " " registered."); fw_dump.dump_registered = 1; + err = -EEXIST; break; case 0: printk(KERN_INFO "firmware-assisted kernel dump registration" " is successful\n"); fw_dump.dump_registered = 1; + err = 0; break; } + return err; }
void crash_fadump(struct pt_regs *regs, const char *str) @@ -1006,7 +1014,7 @@ static unsigned long init_fadump_header( return addr; }
-static void register_fadump(void) +static int register_fadump(void) { unsigned long addr; void *vaddr; @@ -1017,7 +1025,7 @@ static void register_fadump(void) * assisted dump. */ if (!fw_dump.reserve_dump_area_size) - return; + return -ENODEV;
ret = fadump_setup_crash_memory_ranges(); if (ret) @@ -1032,7 +1040,7 @@ static void register_fadump(void) fadump_create_elfcore_headers(vaddr);
/* register the future kernel dump with firmware. */ - register_fw_dump(&fdm); + return register_fw_dump(&fdm); }
static int fadump_unregister_dump(struct fadump_mem_struct *fdm) @@ -1218,7 +1226,6 @@ static ssize_t fadump_register_store(str switch (buf[0]) { case '0': if (fw_dump.dump_registered == 0) { - ret = -EINVAL; goto unlock_out; } /* Un-register Firmware-assisted dump */ @@ -1226,11 +1233,11 @@ static ssize_t fadump_register_store(str break; case '1': if (fw_dump.dump_registered == 1) { - ret = -EINVAL; + ret = -EEXIST; goto unlock_out; } /* Register Firmware-assisted dump */ - register_fadump(); + ret = register_fadump(); break; default: ret = -EINVAL;