On 2021/3/10 10:22 上午, Jie Deng wrote:
On 2021/3/4 17:15, Jason Wang wrote:
+ }
+
+ if (msgs[i].flags & I2C_M_RD)
+ memcpy(msgs[i].buf, req->buf, msgs[i].len);
Sorry if I had asked this before but any rason not to use msg[i].buf
directly?
The msg[i].buf is passed by the I2C core. I just noticed that these
bufs are not
always allocated by kmalloc. They may come from the stack, which may
cause
the check "sg_init_one -> sg_set_buf -> virt_addr_valid" to fail.
Therefore the
msg[i].buf is not suitable for direct use here.
Regards.
Right, stack is virtually mapped.
Thanks
