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SubjectRe: [RFC PATCH 1/4] fdomain: Resurrect driver (core)
> +/* FIFO_COUNT: The host adapter has an 8K cache (host adapters based on the
> + * 18C30 chip have a 2k cache). When this many 512 byte blocks are filled by
> + * the SCSI device, an interrupt will be raised. Therefore, this could be as
> + * low as 0, or as high as 16. Note, however, that values which are too high
> + * or too low seem to prevent any interrupts from occurring, and thereby lock
> + * up the machine.
> + */

Normally we use

/*
* ...
*/

style comments. I'm not sure it is worth bothering to change it in this
driver, though.

> + cmd->SCp.ptr += len;
> + cmd->SCp.this_residual -= len;
> + if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
> + --cmd->SCp.buffers_residual;
> + ++cmd->SCp.buffer;
> + cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);

This isn't safe on highmem systems. At very least we need a depends on
!HIGHMEM for the drivers selecting this core driver. If you feel like
doing the work it should use scsi_kmap_atomic_sg and
scsi_kunmap_atomic_sg.

> +static void fdomain_work(struct work_struct *work)
> +{
> + struct fdomain *fd = container_of(work, struct fdomain, work);
> + struct Scsi_Host *sh = container_of((void *)fd, struct Scsi_Host,
> + hostdata);

This looks odd. We should never need a void cast for container_of.

> + /* Abort calls fdomain_finish_cmd, so we do nothing here. */
> + if (cmd->SCp.phase & aborted)
> + ;

This is a no-op..

> + if (fd->chip == tmc1800 && !cmd->SCp.have_data_in
> + && (cmd->SCp.sent_command >= cmd->cmd_len)) {

&& goes on the first line, no need for the inner braces on the second
line.

> +int fdomain_host_reset(struct scsi_cmnd *cmd)

Should be static.

> +struct scsi_host_template fdomain_template = {

Should be marked const.

> + if (fdomain_test_loopback(base))
> + return NULL;
> +
> + if (!irq) {
> + if (dev_is_pci(dev)) {
> + dev_err(dev, "PCI card has no IRQ assigned");
> + return NULL;
> + }
> + irq = irqs[(inb(base + Configuration1) & 0x0e) >> 1];

The irqs lookup should probably go into the callers that need it.

> + else if (sig && (sig->bios_major > 0) &&

No need for the inner braces.

> +EXPORT_SYMBOL(fdomain_create);

EXPORT_SYMBOL_GPL for internals like this and fdomain_destroy.

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