diff options
| author | Vladimir Serbinenko <phcoder@gmail.com> | 2014-01-27 23:46:46 +0100 |
|---|---|---|
| committer | Rudolf Marek <r.marek@assembler.cz> | 2014-02-01 18:38:32 +0100 |
| commit | dec919890e2073d83679b0b0fcafa2114f33b826 (patch) | |
| tree | aaab400f807212c957fdf3718ab7b62b3d50c356 /src | |
| parent | 5ef4220693aa727094b7cd9cadfaab51a13ed3e9 (diff) | |
smbus: Add guards to avoid calling NULL.
Many of SMBus functions are unavailable on many controllers.
While calling unavailable function is bad, it shouldn't lead
to spectacular crash.
Change-Id: I7912f3bbbb438603893223a586dcedf57e8a7e28
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/4837
Tested-by: build bot (Jenkins)
Reviewed-by: Rudolf Marek <r.marek@assembler.cz>
Diffstat (limited to 'src')
| -rw-r--r-- | src/device/smbus_ops.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/src/device/smbus_ops.c b/src/device/smbus_ops.c index bcef4cd3cc..41b31ed9a9 100644 --- a/src/device/smbus_ops.c +++ b/src/device/smbus_ops.c @@ -79,59 +79,89 @@ int smbus_set_link(device_t dev) return pbus_num; } +#define CHECK_PRESENCE(x) \ + if (!ops_smbus_bus(get_pbus_smbus(dev))->x) { \ + printk(BIOS_ERR, "%s missing " #x "\n", \ + dev_path(dev)); \ + return -1; \ + } + + int smbus_quick_read(device_t dev) { + CHECK_PRESENCE(quick_read); + return ops_smbus_bus(get_pbus_smbus(dev))->quick_read(dev); } int smbus_quick_write(device_t dev) { + CHECK_PRESENCE(quick_write); + return ops_smbus_bus(get_pbus_smbus(dev))->quick_write(dev); } int smbus_recv_byte(device_t dev) { + CHECK_PRESENCE(recv_byte); + return ops_smbus_bus(get_pbus_smbus(dev))->recv_byte(dev); } int smbus_send_byte(device_t dev, u8 byte) { + CHECK_PRESENCE(send_byte); + return ops_smbus_bus(get_pbus_smbus(dev))->send_byte(dev, byte); } int smbus_read_byte(device_t dev, u8 addr) { + CHECK_PRESENCE(read_byte); + return ops_smbus_bus(get_pbus_smbus(dev))->read_byte(dev, addr); } int smbus_write_byte(device_t dev, u8 addr, u8 val) { + CHECK_PRESENCE(write_byte); + return ops_smbus_bus(get_pbus_smbus(dev))->write_byte(dev, addr, val); } int smbus_read_word(device_t dev, u8 addr) { + CHECK_PRESENCE(read_word); + return ops_smbus_bus(get_pbus_smbus(dev))->read_word(dev, addr); } int smbus_write_word(device_t dev, u8 addr, u16 val) { + CHECK_PRESENCE(write_word); + return ops_smbus_bus(get_pbus_smbus(dev))->write_word(dev, addr, val); } int smbus_process_call(device_t dev, u8 cmd, u16 data) { + CHECK_PRESENCE(process_call); + return ops_smbus_bus(get_pbus_smbus(dev))->process_call(dev, cmd, data); } int smbus_block_read(device_t dev, u8 cmd, u8 bytes, u8 *buffer) { + CHECK_PRESENCE(block_read); + return ops_smbus_bus(get_pbus_smbus(dev))->block_read(dev, cmd, bytes, buffer); } int smbus_block_write(device_t dev, u8 cmd, u8 bytes, const u8 *buffer) { + CHECK_PRESENCE(block_write); + return ops_smbus_bus(get_pbus_smbus(dev))->block_write(dev, cmd, bytes, buffer); } |