diff options
| author | Paul Bolle <pebolle@tiscali.nl> | 2016-03-03 15:01:40 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2016-06-10 12:39:09 +0300 |
| commit | 7faf90ef995ea470f32f43810266ece8ac8ba6c7 (patch) | |
| tree | 06f5b451c84c9ad10bd6770ddd7e56ac2e736f2c | |
| parent | 0145071b33142cbccffb51486b1ce921677b1d2d (diff) | |
| download | linux-7faf90ef995ea470f32f43810266ece8ac8ba6c7.tar.xz | |
lguest: Read length of device_cap later
Read the length of the capability with type VIRTIO_PCI_CAP_DEVICE_CFG
only when we're sure we're going to need it. Which is just before the
check whether the virtio console actually has an emerg_wr field.
Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: lguest@lists.ozlabs.org
Link: http://lkml.kernel.org/r/1457006501-5377-2-git-send-email-pebolle@tiscali.nl
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | arch/x86/lguest/boot.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c index 3847e736702e..146d11c8cf78 100644 --- a/arch/x86/lguest/boot.c +++ b/arch/x86/lguest/boot.c @@ -1258,7 +1258,7 @@ static void probe_pci_console(void) u8 vndr = read_pci_config_byte(0, 1, 0, cap); if (vndr == PCI_CAP_ID_VNDR) { u8 type, bar; - u32 offset, length; + u32 offset; type = read_pci_config_byte(0, 1, 0, cap + offsetof(struct virtio_pci_cap, cfg_type)); @@ -1266,15 +1266,12 @@ static void probe_pci_console(void) cap + offsetof(struct virtio_pci_cap, bar)); offset = read_pci_config(0, 1, 0, cap + offsetof(struct virtio_pci_cap, offset)); - length = read_pci_config(0, 1, 0, - cap + offsetof(struct virtio_pci_cap, length)); switch (type) { case VIRTIO_PCI_CAP_DEVICE_CFG: if (bar == 0) { device_cap = cap; device_offset = offset; - device_len = length; } break; case VIRTIO_PCI_CAP_PCI_CFG: @@ -1297,6 +1294,8 @@ static void probe_pci_console(void) * emerg_wr. If it doesn't support VIRTIO_CONSOLE_F_EMERG_WRITE * it should ignore the access. */ + device_len = read_pci_config(0, 1, 0, + device_cap + offsetof(struct virtio_pci_cap, length)); if (device_len < (offsetof(struct virtio_console_config, emerg_wr) + sizeof(u32))) { printk(KERN_ERR "lguest: console missing emerg_wr field\n"); |